Alternating-current relay



E. O. THOMPSON I Nov. 13, 1928 1,691,091

ALTERNA'I'ING CURRENT RELAY Filed July 19 1922 0 'INVENTOR. 7W JOH/ BY ATTORNEY 1 great sensitivity and high description, when of the circuits which Patented Nov, 13, 192s.

mma o. momsonor ronu rmsvrrrn, NEW YORK, assrenon T AMERICAN EPJHONE AND TELEGRAPH COMPANY, A conroenriou on NEW YO K.

1 a I 4 1,691,091 PATENT OFFI E.-

ALTEBNATING-CURRENT RELAY.

Application filed July 19,

This invention relates to relays, and more particularly to devices of this character which are adapted tobe used in'connection *with electrical currents of comparatively high frequency. p i

An object of -the'in'vention" is .to provide an alternating current relay thatshall have selectivity, and which shall respond with certainty to currents of a desiredfrequ'ency. Another objectof theinventio'n is to'pro'vide means forthe 'adjustmentand polarization of the device. Theseobjects and further objects of the inventionwi-llbe apparent from the following read in connection with the attached drawing in which certain embodiments thereof are illustrated.

In the drawings, in which like characters of'reference designatelike parts throughout,

Figure 1 is a side elevation in section of the improved relay; Fig. 2 is anend view thereof on the line-2.-2of Fig. 1 looking in the direction of the arrows; Fig. 3-is a perspective view of the device, and Fig. 4 .is a diagram may be used in conned tion therewith. The relay shown in the d rawing is designed to respond selectively to alternating currents, for instance of 1000 cycles. Suchcurrent is employed on long telephone lines for signaling, and comesi'n much attenuated to aterminal' station. I

Referring tothe drawings,=5 represents a base having a laminated yoke or frame 6 mounted longitudinally thereof The frame 6 maybe secured to the base by brackets 7 I which are provided on eitherside of the frame and at the ends thereof. The frame comprises a horizontal bar having two vertii. calcores8, 8, one at either end of the, bar,

and avertical member 9 intermediate said cores; these verticalmembers are formedintegral with said bar. The cores are composed of any suitable material, and each has a'winding 10, 10' associated therewith in the customary manner. A pair of are affixed to the base 5 near the edges'of the longer sides thereof inl'approximate transverse alinement. with the vertical member 9. These standards carry a torsional support. 12 which isv mounted so as to. move thereon, and

is controlled in its movement by an armature 13. The torsional support12 may be tuned by varying its momentof inertia, or by varying the elasticity of said support. Thearmature 13 may be secured to the support 12 armature, and

by the length of th former 24 and return standards, 11, 11.,

'of the middle core 9 1922.- Serial NO. 5760519.

in anydcsircd manner, as, for instance, by welding. The mounting the armature 1.3 will cause it to be balanced against mechanical. disturbances. 'Aninverted V-shaped contact member 14. is supported on the armature 12'by means of outwardly turned arms 15, 13,v which rest flatly on thetop surface ofjithe are suitably secured thereto. At the approximate juncture of the arms of the member 14, a contact. plug 16 is provided. which cooperates with stop pins 17 posi tioned at either side thereof to plitude of movement of the member 1st. The member 14 has a contact surface pro idcd. near its top which tion, as will later appear, with a contact sur. face 18 on adjusting screw 19. screw 19 serves to vary the gap between the two. contact surfaces,-and the contact travel between these surfaces, is further governed e arms of the member. 14-, which may be of any length desired. The stop pins 17 and adjustingscrew 19 are mounted upona vertical support 20 in any well known manner, and said support may be affixed to the base 5 by means of screws. The.

support 20 and other components of the re lay structure which are mounted on the base 5.-arc insulated therefrom asby mica, rubber or the like. I

In the diagram shown in Fig. 4, the circuit for polarizing the relay may be traced as follows: From battery to neutral point 21, where the circuit divides into two paths, one path passing through the winding 10 of core 8, conductor 22, coil 23, mid-point of transby conductor 25. The other path for the polarizing circuit continues from neutral point 21 through the winding 10 of core 8, conductor 26, coil 27, mid point of transformer 24 and return by conductor 25. The connection of battery over the path j ust outlined, assuming the flow to be in the direction indicated by the dotted, ar-

frows, polarizes the cores 8 and 8 and causes the poles of each to become north and the pole to become south, thus magnetizing the armature 13 in two sections, making each end of thearmature south and the middle of the armature north,

: Thecircuit through which alternating curlimit the min projects toone side thereoit andis adapted to make electrical connec-L The adjusting rent flowsmay be traced from source of alter- 'nating current over both sides of the line 28,

through the coils of the transformer 24,"over conductors the relay,'1n the arrow in full lines.

fect produced by the direct current flow 1n winding lO, thereby weakening the magnetic pull of core 8 upon one end of the armature 13, and aids the magnetic effect produced by direct current flow in winding 10, thereby strengthening the magnetic pull of the core 8 upon the other end of the armature 13;

Under this condition the armature 13 moves about its central supporting point on the torsional member 12 toward the pole of core 8, causing the member 14; which is mounted thereon to partake of such movement and close contact 18. The closing of the contact 18 completes a local circuit from armature 13 which is grounded, over the conductor 31 and through said closed contact over conductor 30 to an electromechanism such as a relay, which may be connected to battery. On the reversal of or opposite flow of alter nating current, the armature will be attracted toward the pole of core 8, causing the member ii to break contact at point 18, and the magnetic condition created in said windings will be inverse to that just outlined. The amplitude of movement of the armature will thus continue under the ma netic influence of the windings, making and breaking the contact at point 18 at thedesired frequency. Thus during the time the contact 18 is intermittently opening and closing, the electromechanism or relay connected with the conductors 30 and 31 is caused to operate, and it in turn said cores for mounting It is pointed out that the tuning of the armature is largely controlled by the strength of the regulated battery, and that as the armature is pivoted at its center, the moment of inertia is small. It will be also obvious that a saving in copper wire is effected, by the use ofthe same windings for the polarizing circuit and Operating circuit.

What is claimed is: V

1. A relay comprising a yoke, said yoke having a plurality of vertical cores, an armature, a torsional support for the armature, and a vibrating contact member mounted longitudinally of said armature.

2. A relay comprising a base, a yoke mounted thereon, said yoke comprising a plurality of vertical cores, windings for two of said cores, an armature, a torsional support for the armature, standards afiixed on the base in transverse alinement with one of port, and a vibrating contact member mounted longitudinally of said armature on either.

side of the torsional support.

3. A relay comprising a base, a yoke mounted thereon, said yoke comprising a plurality of vertical cores, windings for two of said cores through which direct current and alternating current may iiow, an armature controlled by the magnetic influence created in said cores by the flow of said currents through said windings, a torsional support for the armature, and a vibrating contact member mounted on said armature and partaking of the movement thereof.

In testimony whereof, I have signed my name to this specification this 18th .day of July, 1922.

ELMER O. THOMPSON.

said torsional sup- 

